holley carb ?
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holley carb ?

  1. #1
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    Default holley carb ?

    So I was actually able to try to get the boat in the water to try to get it timed and get fuel pressure set. I can get it running, but it won't run for long before it dies out. Its def. a fuel issue. I have only worked with rochesters and am not sure if the holley circuits are the same, but it sounds like a float/needle/seat type problem, like the bowls not filling with fuel, sound right do you guys?

    how do I check that on a holley? Do I take the ends off or do I take it apart from the top like a roch?

    Thanks in advance guys.

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    Senior Member Bubbletop409's Avatar
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    Most Holleys I have seen have sight plugs on both fuel bowls, small brass plugs about 2/3 up one side, fuel should be at lower edge of hole with engine idleing.
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    Senior Member GT Jets's Avatar
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    A Holley marine toploader is more involved, what list number do you have?
    GT


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    Senior Member Rivernut's Avatar
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    Always have a fire extiguisher and a towel to toss over a carb fire handy. It's most likely a 4150 or 4160 style. Give us the numbers that are on the choke air horn (the raised part in the middle). I would reset the idle screws to 1.25 turns out from closed. They are located on both sides of the metering blocks just inboard of the fuel bowls on the primary side (front with choke). It may also have them on the secondary side (rear), depending on the model. It probably has the float sight holes on the side of each fuel bowl. When the float level is lowered the fuel level only drops when its used by the engine, easy on the primary side using the idle circuit, but you may have to go for a run for it to drop on the secondary side. They take a medium flat blade screwdriver. I would start the boat with it sitting level, even a few seconds should be good enough, then shut it down and check the level. Always a good idea to have paper towels or a cloth towel to soak up any fuel that may slosh or dump out. The fuel height should be at the bottom of the hole and come out when you jiggle the boat. Set the level by loosening the screw on the top of the fuel bow and turn the nut beneath it. Clockwise = up, CC = down. Once everything is tight, check for fuel leaks by touching all around any fittings that were loosened and looking for gas and again after a short power run if you get that far. If the boat sat for months the fuel bowls and passages may be all shellacked inside and need cleaning.
    Last edited by Rivernut; 08-16-2010 at 04:39 AM.

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    the horn's milled off but its a 4150 im pretty certain. How do you get the fuel bowls off to clean them out?

    Thanks alot guys.

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    Senior Member lbhsbz's Avatar
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    Quote Originally Posted by PowerAddict View Post
    the horn's milled off but its a 4150 im pretty certain. How do you get the fuel bowls off to clean them out?

    Thanks alot guys.
    You take out those 4 bolts you see that are holding each fuel bowl on.

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    Quote Originally Posted by PowerAddict View Post
    the horn's milled off but its a 4150 im pretty certain. How do you get the fuel bowls off to clean them out?

    Thanks alot guys.
    to take the carb apart...loosen the 4 screws/bolts on the end of the float bowls...tap the bowls lightly & they will come off...tap the metering blocks & they will come off...unscrew the needle & seats from the top of the float bowls...you can clean the inside of the float bowls with solvent, therefore, not haveing to take the floats out...check the n/s for stickyness from varnish...after you clean everything...put the n/s back in & set the floats by inverting the bowl & setting the float parallel to the bottom with the nut on the n/s...this will give you a starting point for the float level...use "non stick" gaskets for the metering blocks & float bowls...you do not need a kit!...put it back on the motor & try it...you can make final adjustments after you get it running ie: float level etc...Holley carbs are no mystery or secret science...once you have taken one apart, you will find out how easy they are to clean etc ...if i can be of any help...just ask! ...do you have any pics of the carb?

    FastRat

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    Default top/bottom or top on the bottom....

    Quote Originally Posted by FastRat View Post
    to take the carb apart...loosen the 4 screws/bolts on the end of the float bowls...tap the bowls lightly & they will come off...tap the metering blocks & they will come off...unscrew the needle & seats from the top of the float bowls...you can clean the inside of the float bowls with solvent, therefore, not haveing to take the floats out...check the n/s for stickyness from varnish...after you clean everything...put the n/s back in & set the floats by inverting the bowl & setting the float parallel to the bottom,(ACTUAL TOP OF THE BOWL), with the nut on the n/s...this will give you a starting point for the float level...use "non stick" gaskets for the metering blocks & float bowls...you do not need a kit!...put it back on the motor & try it...you can make final adjustments after you get it running ie: float level etc...Holley carbs are no mystery or secret science...once you have taken one apart, you will find out how easy they are to clean etc ...if i can be of any help...just ask! ...do you have any pics of the carb?

    FastRat
    A little clarification, bottom vs top when inverted CAN get confusing..... Ray
    LOUD BOATS SAVE LIVES

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